package StreamFileIO;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class StreamTest {
    public static void main(String args[]) throws IOException{
//        char c;
//        String str;
//        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//        System.out.println("输入字符，按下'q'退出");
//        do{
////            c = (char)br.read();
//            str = br.readLine();
//            System.out.println(str);
//        }while (!str.equals("end"));
        int a,b;
        a = 'A';
        b = 'B';
        System.out.write(a);
        System.out.write('\n');
        System.out.write(b);
    }
}
